<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="vue.js"></script>
</head>
<body>
    <div id="root">
        <input type="text" v-model="msg">
        <p>{{msg | filterA}}</p>
    </div>
 
    
    <script>
        Vue.filter("filterA", function(value){
            let val=''
            if(!isNaN(value) && value !=''){
                if(value %1==0 && value!=0){//整数
                    val=value+".00"
                    }
                else if(value==0){
                    val=''
                    }
                else{//小数
                //parseFloat:将字符串转换成浮点数
                //toFixed:可四舍五入为指定位的小数位数的数字
                val=parseFloat(value).toFixed(2)
                }
            }else{
                val=''
            }
            return val
        })

        new Vue({
            el:"#root",
            data:{
                msg:"d d "
            }
        })
    </script>
</body>
</html>